For me too much emphasis is placed on the realism thing.  I remember my first decoy was an inflatable that looked more like a pool toy and birds responded to it.  When I use one now it is a cheap, foldable Flambeau probably available most anywhere.  I'm old but I was told by older turkey hunters (now gone) that they'd use black bags, how or whatever I don't know.  Keep in mind this coming from a guy who once bought a MAD dog whistle to make them gobble, LOL.